C1275 Diagnostic Trouble Code

C1275 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C1275 diagnostic trouble code may include:

The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Faulty or damaged wiring
Hesitation upon acceleration
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code C1275 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C1275.

Fortunately, C1275 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1275 Trouble Code For Specific Cars

C1275 Porsche Cayenne Type 9pa
C1275 Suzuki Lj 50 Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Ground
C1275 Excelsior Albert Injection Pump Fuel Metering Control "B" Range/Performance (Cam/Rotor/Injector)
C1275 Mercury Marauder Air Suspension LR Height Sensor Circuit Short To Battery
C1275 Peugeot Sesame Engine Oil Pressure Sensor/Switch High Voltage
C1275 Zaz 966 SCP (J1850) Invalid or Missing Data for Vehicle Speed
C1275 Sheffield-simplex 30 Insufficient RMP Increase During Spark Test